Reflex actions are formed instantaneously in response to the stimulus that has no time to think. For instance the sensory nerves that detect the heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to itRead more
Reflex actions are formed instantaneously in response to the stimulus that has no time to think. For instance the sensory nerves that detect the heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to it quickly (output) is known as reflex arc.
Reflex action are generated in spinal cord and the information also reaches brain. This
helps the brain to record this event and remember it for future use. Brain helps the person to get awareness of the stimulus and prevent himself from that situation again.
Smell of an agarbatti is detected by Nose, olfactory receptors present in the nose sends electrical signal to the fore brain. Fore brain interprets this signal as the incense stick to be detected as smell.
Smell of an agarbatti is detected by Nose, olfactory receptors present in the nose sends
electrical signal to the fore brain. Fore brain interprets this signal as the incense stick to be
detected as smell.
Cerebellum which is a part of Hind brain is responsible for Controls the motor functioning hence it is the part reengaged in the maintenance of posture and equilibrium of the body.
Cerebellum which is a part of Hind brain is responsible for Controls the motor functioning
hence it is the part reengaged in the maintenance of posture and equilibrium of the body.
Between the synapse between two neurons electric signals are converted into chemicals that can easily cross over the gap and pass on the chemical messenger to next neuron where it is converted back to electrical signal.
Between the synapse between two neurons electric signals are converted into chemicals that can easily cross over the gap and pass on the chemical messenger to next neuron where it is converted back to electrical signal.
Reflex action are the involuntary actions that occur in response to stimuli. They occur without involvement of conscious areas of brain. All the reflex actions are unconscious actions. Reflex action occurs brain and spinal cord of central nervous systems. On the other hand voluntary actions are thosRead more
Reflex action are the involuntary actions that occur in response to stimuli. They occur
without involvement of conscious areas of brain. All the reflex actions are unconscious
actions. Reflex action occurs brain and spinal cord of central nervous systems.
On the other hand voluntary actions are those which occur under the control of cerebellum of the brain Walking is learnt as we grow. Walking is controlled by brain as is used when
required.
The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome. Females have a pair of X chromosomes anRead more
The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome.
Females have a pair of X chromosomes and males have X and Y chromosomes as sex chromosome. Sex of child in humans is determined by the type of male haploid gamete that fuses with the female egg. During spermatogenesis, males produce two types of gametes, half of the sperms have an X chromosome and the other half have a Y chromosome. The female egg always has an X chromosome.
So if the male gamete with the X chromosome fuses with the female egg, the child will be female and if the male gamete with the Y chromosome fuses with the female egg, the child will be male.
The given information is not enough to determine the traits- blood group A or O is dominant. In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive. Here the father's blood group is A hence, it can either be homozygous (AA) or heterozygous (AO). The mothRead more
The given information is not enough to determine the traits- blood group A or O is dominant.
In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive.
Here the father’s blood group is A hence, it can either be homozygous (AA) or heterozygous (AO).
The mother’s blood group is O and it is only possible if it is heterozygous (OO).
For the daughter to have blood group O the father must be heterozygous (AO) and mother must be (OO).
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independeRead more
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independent assortment.
Mendel conducted the experiments using Pisum sativum or pea plant. He selected homozygous tall (TT) and dwarf (tt) pea plants. He crossed the tall pea plant with the dwarf pea plant. It was observed that the F1 generation are all tall plants. Thus, it was concluded that the gene causing tallness iRead more
Mendel conducted the experiments using Pisum sativum or pea plant.
He selected homozygous tall (TT) and dwarf (tt) pea plants.
He crossed the tall pea plant with the dwarf pea plant.
It was observed that the F1 generation are all tall plants.
Thus, it was concluded that the gene causing tallness is dominant while the gene causing dwarfness is recessive.
The trait expressing itself in the hybrid is the dominant one.
This experiment proves Mendel’s first law of inheritance.
It states that when a pair of contrasting factors is brought in a hybrid, one factor inhibits the appearance of the other, one which inhibits is the dominant one and which is inhibited is recessive.
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions. The natural environment also changes, and variations in species which become suited to the environment help it to survive.
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions.
The natural environment also changes, and variations in species which become suited to the environment help it to survive.
What is the role of the brain in reflex action?
Reflex actions are formed instantaneously in response to the stimulus that has no time to think. For instance the sensory nerves that detect the heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to itRead more
Reflex actions are formed instantaneously in response to the stimulus that has no time to think. For instance the sensory nerves that detect the heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to it quickly (output) is known as reflex arc.
See lessReflex action are generated in spinal cord and the information also reaches brain. This
helps the brain to record this event and remember it for future use. Brain helps the person to get awareness of the stimulus and prevent himself from that situation again.
How do we detect the smell of an agarbatti (incense stick)?
Smell of an agarbatti is detected by Nose, olfactory receptors present in the nose sends electrical signal to the fore brain. Fore brain interprets this signal as the incense stick to be detected as smell.
Smell of an agarbatti is detected by Nose, olfactory receptors present in the nose sends
See lesselectrical signal to the fore brain. Fore brain interprets this signal as the incense stick to be
detected as smell.
Which part of the brain maintains posture and equilibrium of the body?
Cerebellum which is a part of Hind brain is responsible for Controls the motor functioning hence it is the part reengaged in the maintenance of posture and equilibrium of the body.
Cerebellum which is a part of Hind brain is responsible for Controls the motor functioning
See lesshence it is the part reengaged in the maintenance of posture and equilibrium of the body.
What happens at the synapse between two neurons?
Between the synapse between two neurons electric signals are converted into chemicals that can easily cross over the gap and pass on the chemical messenger to next neuron where it is converted back to electrical signal.
Between the synapse between two neurons electric signals are converted into chemicals that can easily cross over the gap and pass on the chemical messenger to next neuron where it is converted back to electrical signal.
See lessWhat is the difference between a reflex action and walking?
Reflex action are the involuntary actions that occur in response to stimuli. They occur without involvement of conscious areas of brain. All the reflex actions are unconscious actions. Reflex action occurs brain and spinal cord of central nervous systems. On the other hand voluntary actions are thosRead more
Reflex action are the involuntary actions that occur in response to stimuli. They occur
See lesswithout involvement of conscious areas of brain. All the reflex actions are unconscious
actions. Reflex action occurs brain and spinal cord of central nervous systems.
On the other hand voluntary actions are those which occur under the control of cerebellum of the brain Walking is learnt as we grow. Walking is controlled by brain as is used when
required.
How is the sex of the child determined in human beings?
The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome. Females have a pair of X chromosomes anRead more
The sex-determining mechanism in humans is the XY type. Humans contain 23 pairs of chromosomes. 22 pairs of chromosomes are the same in both males and females, which are called autosomes. The 23rd pair is different in both sexes and is known as sex chromosome.
Females have a pair of X chromosomes and males have X and Y chromosomes as sex chromosome. Sex of child in humans is determined by the type of male haploid gamete that fuses with the female egg. During spermatogenesis, males produce two types of gametes, half of the sperms have an X chromosome and the other half have a Y chromosome. The female egg always has an X chromosome.
So if the male gamete with the X chromosome fuses with the female egg, the child will be female and if the male gamete with the Y chromosome fuses with the female egg, the child will be male.
See lessA man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
The given information is not enough to determine the traits- blood group A or O is dominant. In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive. Here the father's blood group is A hence, it can either be homozygous (AA) or heterozygous (AO). The mothRead more
- The given information is not enough to determine the traits- blood group A or O is dominant.
- In ABO blood grouping blood type A is always dominant whereas, the blood type O is always recessive.
- Here the father’s blood group is A hence, it can either be homozygous (AA) or heterozygous (AO).
- The mother’s blood group is O and it is only possible if it is heterozygous (OO).
- For the daughter to have blood group O the father must be heterozygous (AO) and mother must be (OO).
See lessHow do Mendel’s experiments show that traits are inherited independently?
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independeRead more
Genes located on different chromosomes will be inherited independently of each other. Mendel observed that, when peas with more than one trait were crossed, the progeny did not always match the parents. This is because different traits are inherited independently – this is the principle of independent assortment.
See lessHow do Mendel’s experiments show that traits may be dominant or recessive?
Mendel conducted the experiments using Pisum sativum or pea plant. He selected homozygous tall (TT) and dwarf (tt) pea plants. He crossed the tall pea plant with the dwarf pea plant. It was observed that the F1 generation are all tall plants. Thus, it was concluded that the gene causing tallness iRead more
- Mendel conducted the experiments using Pisum sativum or pea plant.
- He selected homozygous tall (TT) and dwarf (tt) pea plants.
- He crossed the tall pea plant with the dwarf pea plant.
- It was observed that the F1 generation are all tall plants.
- Thus, it was concluded that the gene causing tallness is dominant while the gene causing dwarfness is recessive.
- The trait expressing itself in the hybrid is the dominant one.
- This experiment proves Mendel’s first law of inheritance.
- It states that when a pair of contrasting factors is brought in a hybrid, one factor inhibits the appearance of the other, one which inhibits is the dominant one and which is inhibited is recessive.
See lessHow does the creation of variations in a species promote survival?
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions. The natural environment also changes, and variations in species which become suited to the environment help it to survive.
The variations provide stability to the population of various species by preventing them from getting wiped out during adverse conditions.
See lessThe natural environment also changes, and variations in species which become suited to the environment help it to survive.